VIENNA (AP) — The U.N.’s nuclear agency says it is following up on a Russian warning that a U.S. strike on Syria’s atomic facilities might result in a nuclear catastrophe.

The International Atomic Energy Agency announcement Friday follows a warning from Foreign Ministry spokesman Alexander Lukashevich. He said that a strike on a miniature reactor near Damascus or other unspecified nuclear installations could contaminate the region with radioactivity, adding: “The consequences could be catastrophic.”